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Distributed‐Parameter dynamics by correlation analysis
Author(s) -
Ledbetter James B.,
Bruley Duane F.
Publication year - 1972
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690180123
Subject(s) - forcing (mathematics) , frequency domain , turbulence , time domain , mechanics , limit (mathematics) , range (aeronautics) , power (physics) , control theory (sociology) , chemistry , mathematics , thermodynamics , materials science , physics , mathematical analysis , computer science , control (management) , artificial intelligence , composite material , computer vision
The experimental dynamic response of a distributed‐parameter, simulaneous heat and mass transfer system was investigated using correlation analysis. The system was a wetted‐wall column operating as a nonadiabatic humidifier with both liquid and gas phase in turbulent flow. The experimetnal frequency response results were compared to the values predicted by an existing mathematical model. The investigation also included a study of the effect of employing forcing functions having nonideal power spectra. Analog‐simulated, first‐order systems were tested to verify the computational procedure and to support the conclusions for the humidification system. System dynamic identifications, acceptable for most engineering purposes, were obtained from forcing signals having power spectra which differed significantly from ideality. For the reduction technique employed, a time‐domain record of approximately 2,500 pairs of input‐output data points was found to suffice for a satisfactory analysis. The correlation technique yielded reliable results over approximately the same range of frequencies as reported for previous pulse test studies based on a comparable forcing procedure. However, the results showed an upper frequency limit below that previously achieved by direct frequency forcing of the same system.